A matrix is a rectangular array of numbers. The dimensions of a matrix refer to the number of rows and the number of columns. A 3×2 3 × 2 matrix has three rows and two columns. We add and subtract matrices of equal dimensions by adding and subtracting corresponding entries of each matrix. A matrix can be defined as a rectangular grid of numbers, symbols, and expressions arranged in rows and columns. Brackets around them usually chart these grids. The dimensions of a matrix are represented as R X C, where R is the number of rows, and C is the number of columns. This R X C notation is also called the order of the matrix. There are different types of matrices and are categorized based on the value of their elements, their order, number of rows and columns, etc.